- A
A Cloud VPN tunnel must be established.
Why wrong: Incorrect. A Cloud VPN tunnel is a different technology used for connecting networks over the internet, not required for VPC Network Peering.
- B
Both VPCs must belong to the same organization.
Why wrong: Incorrect. VPC Network Peering can be established between VPCs in the same organization or across different organizations, as long as the projects are in the same or different organizations.
- C
The VPCs must have non-overlapping IP ranges.
Correct. The VPCs must have non-overlapping IP ranges to avoid routing conflicts and allow direct communication.
- D
Both VPCs must be in the same region.
Why wrong: Incorrect. VPC Network Peering can be between VPCs in different regions. There is no region requirement.
Question 243 of 1,000
VPC Peering Non-Overlapping IP Ranges
This PCNE practice question tests your understanding of implementing a virtual private cloud. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. A key principle to apply: vPC Network Peering. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company wants to connect two VPC networks using VPC Network Peering. What is required for this setup?
Quick Answer
The answer is that the VPCs must have non-overlapping IP ranges. This requirement exists because VPC Network Peering establishes a direct, private connection between two networks, and overlapping CIDR blocks would create routing ambiguity, preventing the Google Cloud infrastructure from determining which network should receive a given packet. On the Google Professional Cloud Network Engineer exam, this concept tests your understanding of fundamental peering constraints, often appearing as a distractor where overlapping ranges are presented as acceptable or where a Cloud VPN is incorrectly suggested as a workaround. A common trap is assuming peering requires the same region or organization, but it does not—only the IP ranges must be unique. Remember the memory tip: "Peering needs clearing—no overlapping hearing," meaning the routes must be distinct for the networks to communicate properly.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The VPCs must have non-overlapping IP ranges.
VPC Network Peering requires that the IP ranges of the peered networks do not overlap. Option C is correct. Option A is wrong because a Cloud VPN tunnel is not required for peering; peering is a direct connection. Option B is wrong because VPCs can be in different organizations and still be peered. Option D is wrong because VPCs can be in different regions.
Key principle: VPC Network Peering
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A Cloud VPN tunnel must be established.
Why it's wrong here
Incorrect. A Cloud VPN tunnel is a different technology used for connecting networks over the internet, not required for VPC Network Peering.
- ✗
Both VPCs must belong to the same organization.
Why it's wrong here
Incorrect. VPC Network Peering can be established between VPCs in the same organization or across different organizations, as long as the projects are in the same or different organizations.
- ✓
The VPCs must have non-overlapping IP ranges.
Why this is correct
Correct. The VPCs must have non-overlapping IP ranges to avoid routing conflicts and allow direct communication.
Related concept
VPC Network Peering
- ✗
Both VPCs must be in the same region.
Why it's wrong here
Incorrect. VPC Network Peering can be between VPCs in different regions. There is no region requirement.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- VPC Network Peering
- IP Address Overlap
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
VPC Network Peering
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Review vPC Network Peering, then practise related PCNE questions on the same topic to reinforce the concept.
- →
Implementing a Virtual Private Cloud — study guide chapter
Learn the concepts, then practise the questions
- →
Implementing a Virtual Private Cloud practice questions
Targeted practice on this topic area only
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Google Professional Cloud Network Engineer study guide
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FAQ
Questions learners often ask
What does this PCNE question test?
Implementing a Virtual Private Cloud — This question tests Implementing a Virtual Private Cloud — VPC Network Peering.
What is the correct answer to this question?
The correct answer is: The VPCs must have non-overlapping IP ranges. — VPC Network Peering requires that the IP ranges of the peered networks do not overlap. Option C is correct. Option A is wrong because a Cloud VPN tunnel is not required for peering; peering is a direct connection. Option B is wrong because VPCs can be in different organizations and still be peered. Option D is wrong because VPCs can be in different regions.
What should I do if I get this PCNE question wrong?
Review vPC Network Peering, then practise related PCNE questions on the same topic to reinforce the concept.
What is the key concept behind this question?
VPC Network Peering
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on PCNE
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An engineer runs 'gcloud compute networks peerings list' and sees state 'INACTIVE' for a peering connection. Which is the most likely cause?
hard- ✓ A.The subnet CIDR ranges overlap.
- B.The IAM permissions for the peer are insufficient.
- C.The dynamic routing mode differs.
- D.The firewall rules are missing.
Why A: Overlapping subnet CIDRs cause the peering to be INACTIVE.
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Last reviewed: Jun 24, 2026
This PCNE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCNE exam.
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